Resilient mounting



Nov. 8, 1960 H. J. LOFTXS 24,893

RESILIENT MOUNTING Original Filed Feb, 24. 1956 INVENTOR. l/OME'E J 10F775 United States Patent Oflice RESILIENT MOUNTING Homer J. Loftis, OakHill, Ohio, assignor to Henrite Products Corporation, a corporation ofOhio- Original No. 2,866,613, dated Dec. 30, 1958, Ser. No. 567,522,Feb. 24, 1956. Application for reissue May 31, 1960, Ser. No. 33,069

Claims. (Cl. 248-26) Matter enclosed in heavy brackets appears in theoriginal patent but forms no part of this reissue specification; matterprinted in italics indicates the additions made by reissue.

This invention relates to a resilient mounting and more particularly toimprovements in vibration damping mounting for electric motors and thelike, although not necessarily so limited.

The present invention is an improvement in resilient ring-type mountingssuch as that patented by H. D. Geyer, United States Letters Patent No.2,044,385. The improvements reside chiefly in the means for securing thering-type mounting to a suitable cradle member.

An object of this invention is to provide a resilient mounting includinga suitably constructed cradle member which can be assembled withoutscrews or rivets or the like, thus providing for economical and rapidassembly and installation.

Another object of this invention is to provide a resilient mountinghaving improved torsional yield characteristics, wherein a conventionalresilient mounting ring is modified for yielding attachment to a cradlemember.

Still another object of this invention is to provide a resilientmounting having an inner adjustable split-ring clamp for attachment tothe supported object, the splitring clamp allowing rotational adjustmentof the supported object relative to the support whenever this isdesired.

Other objects and advantages reside in the construction of parts, thecombination thereof and the mode of operation, as will become moreapparent from the following description.

In the drawing Figure 1 is a side elevation showing one end of anelectric motor mounted by means of the resilient mounting of thisinvention.

Figure 2 is an enlarged front elevation of the resilient mounting.

Figure 3 is a sectional view, taken substantially along the line 33 ofFigure 2.

Figure 4 is a side elevation, enlarged to the scale of Figure 2, of theresilient mounting.

Figure 5 is a front elevation, with parts broken away, of a firstmodification of the resilient mounting.

Figure 6 is a side elevation of the modification of Figure 5.

Figure 7 is a front elevation, with parts broken away, of a secondmodification.

Figure 8 is a side elevation of the modification of Figure 7.

Referring to the drawing in detail, Figure 1 shows a portion of anelectric motor 10, or other object to be supported for vibratorymovement, which is provided with a trunnion or hub 12 for engagementwith a resilient mounting. The resilient mounting of this invention,which is indicated by the reference numeral 14, is attached to a supportmember such as that shown at 16 as a means of supporting the motor 10,or the like,

for vibratory motion relative to the support member 16.

The resilient mounting 14 as shown in Figures 2, 3,. and 4 comprises amodified form of the conventional resilient mounting ring for motorsnestled into a cradle member 18. The modified mounting ring includes aninner split-ring clamp 20 for engagement with the hub 12 of the motor,an outer ring segment 22 adapted for attachment to the cradle member 18,and a resilient ring segment 24 disposed between the split-ring clamp 20and the outer ring segment 22.

The inner split-ring clamp 20 is shown as a stamped! metal ring split at26 and provided with opposed outwardly radially extending lugs 28projecting from the ends thereof. Each lug 28 has a hole therein intowhich a threaded screw 30 may be inserted to engage a nut 31 for thepurpose of tightening the clamp upon the hub 12 of the motor. Thesplit-ring clamp 20 is thus of variable diameter and need not bemanufactured to close tolerances.

The resilient ring segment 24 distributed between the inner-split-ringclamp 20 and the outer ring segment 22 is secured to both members byvulcanizing or other suitable means. The resilient ring segment 24,which may be an elastomer such as rubber, functions to absorb and dampvibratory motions of the split-ring clamp 20 attached to the motor 10.Two arcuate slots or openings 32 in the resilient ring segment dividethe segment, so as to provide three radially distributed solid spokes 34which operate to damp torsional as well as radial vibrations. In orderto satisfactorily damp upward thrusts of the motor 10 relative to thesupport member 16, the resilient segment 24 must extend more than aroundthe inner split-ring clamp 20 to provide spokes 34 distributed over morethan 180 of the inner split-ring clamp 20. Ample clearance is provided,however, adjacent the lugs 28 of the split-ring clamp, so that the screw30 may be adjusted to properly tighten the clamp.

The outer ring segment 22 also extends concentric with the innersplit-ring clamp for more than 180, so as to provide support for each ofthe spokes 34.

The present invention relates primarily to the means whereby the outerring segment 22 of the modified resilient mounting ring is secured tothe cradle member 18. In the preferred embodiment of Figures 2, 3, and4, the cradle member 18 is a U-shaped metal plate having a pair offurcations 36, each having an arcuate inner mar gin defining a portionof a substantially semi-circular yoke 38. The outer ring segment 22 ofthe modifiedg resilient mounting ring has a circumferentially eXtend-.ing groove 40 therein, for engaging the yoke 38 so that; the resilientmounting ring may be nestled into the cradle: member 18.

Each furcation 36 is provided with an outwardly di rected tongue portion42 forming an acute angle there with so as to form a notch 44 in theouter margin thereof. Each end of the outer ring segment 22 is bent at50 so as: to wrap around the adjacent furcation 36 to form an inverselydirected flange 46 adjacent the furcation 36. Each flange 46 has anelongate aperture 47 therein, into which the adjacent tongue portion 42projects. A finger 48 is stuck out from each flange 46 into the adjacentnotch 44 to secure the outer ring segment 22 rigidly to the cradlemember 18. The fingers 48 are forcefully wedged into the notches 44, sothat the flanges 46 are strained outwardly. The internal stressesthereby created set up a restoring torque centered in the folded portion50 of the outer ring segment 22, urging the fingers 48 in the notches44. The extreme ends 52 of the flanges 46 are curved outwardly to reduceany tendency the flange 46 may have to buckle under tensile stressescrefieissued Nov. 8, 1960 ated by severe upward thrusts of the supportedobject.

The cradle member 18 has a pair of holes 54 therein, into which may beinserted a bolt 56 for securing the cradle member 18 to the supportmember 16, as shown in, Figure 1.

In the first modificationof Figures and 6, the shape of the outer ringsegment 22 of the preferred embodiment is changed to provide analternative means for securing the outer ring segment to the cradlemember 18. The first modification is provided with an outer. ringsegment 60, which is proportionately smaller in overall length than thesegment 22 of the preferred embodiment, providing for smaller inverselydirected terminal flanges 62 wrapped around the furcations of the cradlemember thus corresponding to the flanges 46 of the preferred embodiment.The flanges 62 each have an elongate aperture 64 therein foraccommodating the adjacent tongue portion of the cradle member 18. Theouter ring segment 60 has a circumferential groove 66 therein, adaptedto receive the yoke of the cradle member 18.

The flanges 62 are each kinked at 68 to shorten the flanges so as todraw the ends thereof into the notches 44 of the cradle member 18. Bymaking the flanges 62 as short as possible, the arcuate kinked portion68 operates as a spring under permanent stress tending to draw or wedgethe wall' portion of the flange bounding the aperture therein into thenotch 44,

In both embodiments of the resilient mounting shown in Figures 2 and 5,the metal stamping, forming the outer ring segment of .the resilientmounting yields to torsional stresses transmitted by the resilient ringsegment 24, permitting damped rotary movement of the mounting ringwithin the cradle member 18, thus augmenting the torsional yield of theresilient ring segment;

In the second modification of Figures 7 and 8, the cradle member and theouter ring segment are further modified to provide another alternativemeans for securing the ring mounting to the cradle member.

The modification of Figures 7 and 8 includes an outer ring segment 70extending substantially more than 180 around a modified inner split-ringclamp 88 said ring segment 70 having therein a square aperture 72adjacent each end thereof, each said aperture exposing a portion of theadjacent resilient ring segment 24. As is in the preferred embodiment,the outer ring segment is provided with a circumferentially extendinggroove 74 adapted to receive the yoke of the cradle member.

The second modification includes a modified U-shaped cradle member 76'having a pair of furcations 78' coopcrating to provide a yoke 80 forengagement'with the outer ring segment 79. Eachfurcation 78 has aninwardly directed tongue'portion 82 adjacent the'end thereof projectinginto the corresponding aperture 72 in the outer ring segment 70 tobecome embedded in the resilient ring segment 24. The tongue portions 82provide notches 84 in the yoke 80 which engage the marginal portions ofthe outer ring segment 70 adjacent the apertures 72 therein. Theseapertures 72 extend to the ends of the furcations 78. are drawn tightlyinto the corresponding notches 84 by bending the extreme ends 86 of theouter ring segment 70 outwardly around the ends of the furcations 78'ofthe cradle member 76 such that the furcations 78 project partially intothe apertures'72. The ends 86 are under permament stress, coacting withthe furcations to draw the wall portions bounding the apertures 72 inthe outer ring segment 70 tightly into the notches 84.

The modification of Figures 7 and'8 shows a modified inner split-ringclamp 88 having radially outwardly extending lugs 90 and 92, the lug 92being folded to double thickness for accommodating a self-tapping screw96, to be substituted for the threaded screw 30 and nut 31 of the otherembodiments of this invention.-

The use of the split-ring clamp in the present invention presentstheadvantage that the supported. object may The marginal portionsbe rotatedto any desired orientation merely by loosening the split-ring clamp.

The enhanced torsional yield characteristics of these mountings makethem highly suitable for use in supporting motors having high startingtorques. Since the ring mounting is yieldingly secured to the cradlemember, the high starting torques of the motor are partially absorbed bythe resilient mounting, diminishing the shock to the rotor shaft andassociated equipment,

Although the preferred embodiment and various modifications of thedevice have been described, it will be understood that within thepurview of this invention various changes may be made in the form,details, proportion and arrangement of parts, the combination thereofand mode of operation, which generally stated consist in a devicecapable of carrying out the objects set forth, as disclosed and definedin the appended claims.

Having thus described my invention, I claim:

1 A resilient mounting attachable to a support member comprising aninner [metal split-] ring [having clamping means thereon whereby theinner ring] which may be [clamped] mounted tightly upon an interiorsupported .member, [a metallic] an outer ring segment surrounding morethan half of said inner ring [but leaving a substantial clearanceadjacent said clamping means], [a] resilient [elastomeric ring segment]means interposed between and secured to both Said inner [metal] ring andsaid outer [metal] ring segment, and a cradle member provided with meansfor attachment to said support member, said cradle member having a pairof furcations projecting therefrom, said furcations having arcuate innermargins defining a substantially semi-circular yoke into whichsaid outerring segment is seated,

said furcations terminating in spaced relation to the ends of said outerring segment, said outer ring segment havmg an inverse curvatureadjacent the ends thereof whereby said ends arch over the ends of saidfurcations, said furcations each having a tongue portion projectingtherefrom and cooperating therewith to form an acute angled' notch inthe margin thereof adjacent said tongue portion, said outer ring.segment having complementary apertures therein receiving said tongueportions, there being.

a misalignment between said tongue portions and said apertures such thatsaid tongue portions in projecting through said apertures cooperate tostress said outer ring segment, the stress in said outer ring segmentbiasing marginal portions thereof adjacent the apertures thereinv Intothe notches of said cradle member to thereby fastenv [metal] ring andsaid outer [metal] ring segment, and

a cradle member provided with means for attachment to said supportmember, said cradle member having a pair of furcations projectingtherefrom, said furcations [have] having arcuate inner margins defininga substantially semi-circular yoke, said outer ring segment having acircumferentially extending groove therein into. which said yoke isseated,the .furcations forming said yoke terminating in spaced relationto the ends of said outer ring" segment, said outer ring segment havingan inverse curvature adjacent the ends thereof whereby said ends archover the ends of. said furcations, said furcations each having a tongueportion projecting therefrom and cooperating-therewith to form" a notchin the margin thereof adjacent said tongue portion, said outerringsegment having complementary apertures therein receiving said'tongpe .portions, there. being a misalignment between said o'uter ringsegment and said cradle member such that said tongue portions inprojecting through said apertures cooperate to stress said outer ringsegment, there being portions of said outer ring segment adjacent theapertures therein seated in the notches of said cradle member, thestress in said outer ring segment biasing said portions into the notchesof said cradle member to fasten said outer ring segment to said cradlemember.

3. A resilient mounting according to claim 2 wherein the portions ofsaid outer ring segment seated in the notches of said cradle membercomprise fingers struck from said outer ring segment adjacent theapertures therein.

4. The resilient mounting according to claim 2 wherein the tongueportions of said cradle member project outwardly of said yoke, theapertures of said outer ring seg- References Cited in the file of thispatent or the original patent UNITED STATES PATENTS 1,996,166 Meyer etal. Apr. 2, 1935 2,044,385 Geyer June 16, 1936 2,296,221 Pontis Sept.15, 1942

